It is an anonymous work or pseudonymous work and 50 years have passed since the date of its publication
It is a collective audiovisual or photographic work and 50 years have passed since the date of its publication (or creation, whatever date is the latest)
It is another kind of work, and 50 years have passed since the year of death of the author (or last-surviving author)
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Photograph of Hernán Siles Zuazo during his first term between 1956-1960. The photograph is the reference for Zuazo's presidential portrait and is more than 50 years old.
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